G (following a name or subject number) — When preceded by a name and comma, indicates the person is a graduate student. When appearing after a subject number, denotes a subject offered primarily to graduate students.

G&S — Gilbert and Sullivan (Players), theater group at MIT, also known as MITGASP

GitHub — github.mit.edu is a MIT site running a hosted version of the GitHub software. It lets people upload and share programming code with others.

Global Address List (GAL) — The global address list (GAL) is a directory that contains entries for every group, user, and contact within MIT's implementation of Microsoft Exchange Server. For Exchange users, the GAL is displayed in the Outlook, Entourage or OWA Address Book on your computer.